Experiments on ion cyclotron damping at the deuterium fourth harmonic in DIII-D

Technical Report · Sat May 01 00:00:00 EDT 1999

DOI:https://doi.org/10.2172/354995· OSTI ID:354995

Pinsker, R I; Petty, C C ^[1]; Baity, F W ^[2]; Bernabei, S; Greenough, N ^[3]; Heidbrink, W W ^[4]; Mau, T K ^[5]; Porkolab, M ^[6]

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1. General Atomics, San Diego, CA (United States)
2. Oak Ridge National Lab., TN (United States)
3. Princeton Plasma Physics Lab., NJ (United States)
4. Univ. of California, Irvine, CA (United States)
5. Univ. of California, San Diego, CA (United States)
6. Massachusetts Inst. of Tech., Cambridge, MA (United States)

Absorption of fast Alfven waves by the energetic ions of an injected beam is evaluated in the DIII-D tokamak. Ion cyclotron resonance absorption at the fourth harmonic of the deuteron cyclotron frequency is observed with deuterium neutral beam injection (f = 60 MHz, B{sub T} = 1.9 T). Enhanced D-D neutron rates are evidence of absorption at the Doppler-shifted cyclotron resonance. Characteristics of global energy confinement provide further proof of substantial beam acceleration by the rf. In many cases, the accelerated deuterons cause temporary stabilization of the sawtooth (monster sawteeth), at relatively low rf power levels of {approximately}1 MW.

• Research Organization: General Atomics, San Diego, CA (United States); Univ. of California, Irvine, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Lab., NJ (United States); Univ. of California, San Diego, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-99ER54463; W-7405-ENG-48; AC05-96OR22464; AC02-76CH03073; FC03-95ER54299; FG02-90ER54084
• OSTI ID: 354995
• Report Number(s): GA-A23092; CONF-990411-; ON: DE99003185; TRN: AHC29924%%199
• Resource Relation: Conference: 13. topical conference on applications of radio frequency power to plasmas, Annapolis, MD (United States), 12-14 Apr 1999; Other Information: PBD: May 1999
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
ENERGY ABSORPTION
ALFVEN WAVES
DOUBLET-3 DEVICE
DEUTERIUM
STABILIZATION
SAWTOOTH OSCILLATIONS
CYCLOTRON HARMONICS
DAMPING
BEAM INJECTION HEATING
HIGH-FREQUENCY HEATING
EXPERIMENTAL DATA